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QRC is backwards compatible with RCX so there should not be any problems. In order to take full advantage of the higher extraction accuracy which QRC can provide, you should request for QRC techfiles from the foundry.

Yes, rcx is still available from Assura package but we should no longer use it as it does not has any bug fixes or enhancements. If any problems are encountered while using rcx, the only solution will be to move to qrc.